Chair control



FIG. 1 is a bottom perspective view of the chair control;

FIG. 2 is a right hand side view of the chair control;

FIG. 3 is a front view of the chair control;

FIG. 4 is a left hand side view of the chair control; and,

FIG. 5 is a bottom view of the chair control.

The portions of the chair control shown in dashed lines do not form part of the claimed design. 

The ornamental design for a chair control, as shown and described. 